Combined type-writing and computing machine.



G, 6. DEGENER.

COMBINED TYPE WRITING AN D COMPUTING MACHINE.

APPLICATION FILED JUNE 30. I914.

Patented Aug. 20, 1918.

2 SHEETS-SHEET I.

WITNESSES:

AT DRNEY G. O. DEGENER.

COMBLNED TYPE WRITING AND COMPUTING MACHINE.

APPLICATION FILED JUNE 30.1914.

INVENTOR WITNE SSES YQZM MJW nrtmnn earns nan OFFICE.

GUSTAVE 0. DEGENER, OF NEW YGRK, N. Y., ASSIGNOR TO UNDERWOOD COMPUTING MACHINE COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

COMBINED TYPE-WRITING AND COMPUTING MACHIN Specification of Letters Patent. Patented Aug. 20, 1918- Application filed June 30, 1914. Serial No. 848,219.

To all whom it may concern:

Be it known'that l GUSTAVE O. DEGENE a citizen or the United States, residing in New York city, in the county of New York and State of New York, have invented certain new and useful Improvements in Combined Type-Writing and Computing Machines, of which the following is a specification.

This invention relates to a combined typewriting and computing machine in which by the mere striking of the numeral keys, numbers can be simultaneously written and computed. and is an improvement on my application No. 801,109, filed November 15, 1913.

In the cxemplification to which the pres ent improvement is applied, atthe striking of a numeral key to write a digit, an interponent is positioned so as to be capable of setting one of a series of index pins'torming part or a valuating mechanism, whereby an extent of rotation is obtained corresponding to the particularnumeral key struck. At the same time, a normally primed or set starting mechanism is tripped, which completes the electric circuit to a motor by closing con tacts therefor, and also operates a hammer to thrustthe selected interponent forward, and set the opposite pin.

At the end of the computing operation, resetting mechanism comes into play automatically to reprime the starting mechanism, so that it will be capable of initiating a subsequent computing action. This operation necessitates the tentative breaking of the motor circuit, or, at least, returns to a normal inetlective position, the part of the starting mechanism which first made the electric cont-act.

In order that the computing operation may be absolutely completed and the resett-ing mechanism surely finish its work, means is provided in the present invention whereby the resetting mechanism delays the breakof the contact and the opening of the circuit to the electric motor, until such time as it has completed its own work and returned to a normal passive position. To do this, the contact maker or circuit closer is placed in a position such that it will be under the 0011- trol of the resetting mechanism, which is provided with an extension or arm to engage the same, and hold this contact maker mechanism is in action.

The contact maker in the present instance is operated from the locking mechanism, which normally holds the starting mechanism in its set condition. The locking mechanism for the starting mechanism has been modified and simplified in the present invention, while still retaining the same posigiveness and surety of operation as heretoore.

Other features and advantages will hereinafter appear.

In the accompanying drawings in its effective position. while the resetting Figure 1 is a fragmentary skeleton perspective view showing the connection of one of the numeral keys to the computing mechanism, and such of the computing mechanism as is deemed necessary to. illustrate the present invention. Further details of this computing mechanism, and the relation to the parts shown herein may be had by refer ence to my application above mentioned.

Fig. 1 is a vertical section through a computing head taken from front to rear.

Fig. 2 is a vertical section taken from right to left from the rear of the machine, showing the starting mechanism asset for action, with the contact maker in its passive position and the contacts spread apart with the circuit open.

Fig. 3 is a View of certain of the parts shown in Fig. 2, but after the locking mechanism has been tripped, and the electric circuit to the motor completed by the contact maker.

Fig. 4 is a View similar to Figs. 2 and 3,

but after the starting mechanism has been almost entirely reset in a position such that the contact maker might have returned to. its normal position as far as the starting sis showing the parts a little farther along in their action, indicating how the starting mechanism is overset, so as to insure the engaging of the cooperating parts of the looking mechanism.

Fig. 6 is an aggregate perspectiveview of the parts of the locking mechanism and the Contact maker, showing them detached and disassembled with respect to each other.

Fig. 7 is a fragmentary section showing the normal relation of the resetting cam to the follower of the resetting mechanism.

Fig. 8 is a detail perspective view showing the relation of the index wheel to the spur Wheel which drives it.

Fig. 9 is a detail perspective view of the computing wheel detent,

Referring more particularly to the separate parts of this invention as embodied in the form shown in the drawings, numeral keys 1 when depressed, in addition to operating the usual type actions of an Under wood typewriting machine to print the digits corresponding to the keys struck, each draw down on a link 2 to rock a bell crank 3. The bell crank 3 draws on a link 4, to

rock a lever 5, which in addition to swinging a locking segment 6 into play, by means of a pin-and-slot connection 7, swings an interponent into the path of a hammer 9, so that when the latter is actuated, the se- 'lected interponent 8 will set the opposite one of a series of index or valuating pins 10 suitably mounted in an index or valuating wheel 11. The pin set determines the extent of rotation of the index wheel 11, making it correspond with the particular numeral key actuated.

The index wheel 11 may be rotated from an electric motor 12, which drives a train of gearing including a motor shaft 13; a bevel gear 14 thereon meshing with a bevel gear 15. The bevel gear 15 is loosely mounted on a-shaft '16, but is connected by a slip clutch 17 to drive the shaft 16. The slip clutch may comprise a hub 18 secured to the bevel gear 15, telescoping with which is a split cylinder 19 fast on the shaft 16. The split cylinder 19, forming one element of the clutch, embraces the hub 18 sufliciently closely to normally form a positive connection between the motor and the shaft 16. If,

however, any of the computing mechanism should become deranged or clog ed in its movement, the clutch formed of these parts 2O meshing with a bevel gear 21 loose on a shaft 22. To connect the bevel gear 21 in driving relation with the shaft 22, it is provided with a toothed clutch 23, into engagement with which may be brought a corresponding toothed clutch 24, splined on the shaft 22. The shaft 22 is provided with a spur Wheel 25, (Fig. 8), which normally rotates idly in a gap formed by the previ ously set pin of the series of index pins 10. The gap, however, is eliminated by the unsetting of this pin at the setting of the new pin, by means of an unsetter 26. These and various other actions essential to a computing operation in this type of machine, are brought into play automatically at the striking of one of the numeral keys 1, by a starting mechansm indicated in general at 27, which is normally primed or set for action.

This starting mechanism may include a shaft 28, having a pinion 29 meshing with a rack 30 on a bar 31. The bar 31 is nor: mally under a tendency to move upwardly under the traction of a tension spring 32.-

The movement of the bar 31, and hence the rotation of the shaft 28, are, however, prevented by a locking mechanism, indicated in general at 132.

The locking mechanism 132-may include a block 33, secured to the shaft 28, and having a squared shoulder 34 (Fig. 6), normally engaged by a pivoted latch 35, which is held to its work by a spring 36. That is to say, when the spring 32 is tensioned, and the starting mechanism all primed or set for action, the parts will be in the positions shown in Figs. 1 and 2, with the latch 35 in engagement with the shoulder 34.

At the striking of a numeral key 1, however, the latch 35 is tripped, to permit an action of the starting mechanism. To do this, each of the links 4 is provided with an enlargement or shoulder 37, which engages the universal disk 38, so as to move the same against the tension of a spring 39. Connected to move with the universal disk 38, there is provided a lever 40, which rocks about its intermediate pivot to thrust forward a tripper 41 against the tension of a spring 42. The tripper 41 bears, at its extreme end, a series of teeth 43, so as to enable it to more readily engage the projecting upper end 44 of the latch 35.

It will thus be seen that when a numeral key 1 is struck, it positions a selected interponent 8, and trips the starting mechanism 27. As soon as the starting mechanism is tripped, the spring 32 acts, drawing the bar 31 upward, and rotating the shaft 28 and all parts carried thereby. Among other parts swung around by the shaft 28, will be the block 33, which is secured thereto.

This block 33, in addition to forming a part of the locking mechanism 132, also provides means for completing the circuit to the electric motor 12. To do this, the block 33, as will be seen by reference to Figs. 2 to 6, is cam-shaped to operate a circuit closer or contact maker 45. The contact maker 45 is provided with a following roller 46, which normally rests in a socket or depression 47 provided in the block 33. When, however, the shaft 28 rotates to carry the block 33 around to the position, shown in Fig. 3, the following roller 46 will be forced out of the socket 47, and swung by the cam surface 48 of the block, to the position shown in Fig. 3, against the tension of a spring (Fig.1),"which acts through a link 45*. Thiscainmin'gaction will rock the contact maker 45'about its pivot 49, so as to swingthe upper endthereof from the position shown in Fig. "2, to the position shown in Fig. .3.

.The upper. end of the contact maker 45 carries a finger 50,,which presses on one of a pair of 'contacts51 and 5 2, so'as to spring them to the position shown in Fig. 3, where.- by they will be brought into engagement with each. other. These contacts 51 and 52 are connected. to the ends of an electric circuit indicated at 53, which is connected to a" suitable source of power and to the electric motor 12. It "will therefore be seen that the starting mechanism excites to action the normally inactive electric motor 12.

In addition'to this, the starting mechanism operates the hammer 9, to strike the key-selected interponent 8, and set the op positepin 10. To do this, the shaft 28 is provided with a dog 54, which in swinging momentarily pulls on a draw rod 55 against the tension 0 a spring 56, so as to slide a bar 57 ,and with it the hammer 9, to such a position that it will strike the interponent Sand set a pin 10; At the same time, the

pinunsetter 26, is forced by a cam 58 on the shaft 28, to' strike the particular pin 10 at the gap in the series of pins. A spring 59 draws a clutch shifter 60 to a position to, close the clutch 23, 24, as soon as the cam 58 moves from under a spring finger 61 provided on the clutch shifter 60.

' we then have the circuit to the motor closed, the clutch '23, 24 closed, the previously set pin unset, the new pin set, so

that the spur wheel may drive the index wheel 11 around until the'gap 'leftby the just set-'pin comes into registertherewith. This rotation will'be carried by strain of gearing (not shown),'.part of which is indicate d' at 62, to a master wheel shaft 63,

which drives, bymeans of a master wheel 64,

the computingwhe'els of a totalizeror computing head 65 in the usualmanner.

'After the index" wheel 11 has completed an extent of movement determined by the distance of th'e' set pin' from the previously set pin, determined by the value'of thenumeral key struck, the motor 12 must be stopped, or, at least, disconnected from the computing mechanismii and the starting mechanism; reset for a subsequent computing operation. ,To' do thi's,fa rocker 66 is swung bya toe ,67 thereon being'c'amm'ed 'aside by the pins 10 as the wheel 11 rotates, so that an arm 68 thereon will engage a springpressed latch 69. on a clutch closer or shifter f- The rocker '66 is also provided with an arm 71, which ata swinging of the rocker,

is brought into the path of the just setpin 1O, so that as the latter comes around to'its home position, with the gap formed thereby in register with the spur wheel, it will swing the rocker 66 back to its original position, carrying with it the latch 69 and the clutch closer 70. The clutch closer 70 will force one element 72 of a clutch into engagement with a second element 73, against the tension of a spring located therebetween. The clutch element 72 is splined on a shaft 74, and driven thereby, while the clutch element 73 is loose on the shaft, and will only be driven when the clutch element 72 is in mesh therewith. The shaft 74 receives its drive from the shaft 16, by means of a pair of meshing bevel gears 76 and 77, so that it will be rotated during a computing operation, when the motor 12 is in action. The reason for closing the clutch 72, 73 is in order to actuate a resetting mechanism 78, which re-primes the starting mechanism 27, and returns all the elements which have taken part in the computing operation to their normal positions.

For this purpose, the clutch element .73 has secured thereon a sleeve 79, on which is provided a cam 80. The cam 80, when ro-. tated with the sleeve 79, engages and operates a following roller 81 secured to one arm 82 of a double bell crank lever 83, so as to rock the latter against the tension of a spring 84. The bell crank lever 83 is pro vided. with another arm 85, which on the rocking thereof, will engage a projection or roller 86 provided on an extension 87 of the bar 31. It will thus be seen that as the cam 80 rotates with the sleeve 79, the bar 31 will be depressed, retensioning the spring 32, and through the rack 30 and the gear 29, returning the shaft 28 and all parts carried thereby to their normal positions.

As the sleeve 79 completes itsrotation, a second cam 88 (Fig. 1) carried thereby, will engage the latch 69 and trip the same, permitting the return of the clutch element 72, under the push of its spring, to its nor 11.0 mal disengaged position with respect to the clutch element 73. This, then, disconnects and throws out of action the resetting mechanism after it has completed its action.

It will be seen that as the resetting mechanism operates to re-prime the starting mechanism, the shaft 28 will be rotated, first to bring the block 33 to the position indicated in Fig. 4, where the following roller 46 will be in register with the depression or socket 47. Under such circumstances, the contact maker 45, if nothing else intervened, might return to its normal position indicated in Fig. 2, and break the circuit to the electric motor 12. This is prevented, however, from the resetting mechanism itself, so long as it remains in action.

To do this, there is provided on the double bell crank lever 83 of the resetting mechanism', an extension or arm 89, which, as the bell crank lever 83 rocks, is arranged to engage a cam edge 90 provided on the contact maker 45, and normally lying in the path of movement of the extension 89. Wethen have the contact maker held in its effective position when the parts assume the positions shown in Fig. l. p

Inasmuch as it is necessary to insure the latch catching under the shoulder 34 of the locking block 33, the starting mechanism is slightly overset to the condition shown in Fig. 5. Under such circumstances, the cam surface on the far side of the depression 47 may engage the following roller 46, and hold the contact maker in its effective position.

As soon, however, as the resetting bell crank 83 returns under the pull of the spring 84:, to its normal position, the starting shaft 28 will return under the pull of the spring 32 as far as the latch 35 will permit it, resetting all parts to their true positions Under such circumstances, the ro1ler46 will register with the depression 47 in the position shown in Fig. 2, and the arm 89, which delayed the opening of the contact will return to its normal position, permitting the contact maker to allow the opening of the circuit to the electric motor 12 so that the motor will stop when the friction of the parts driven idly by it overcomes its momentum as happens after a number of turns,

In addition to the other functions mentioned, the starting mechanism prevents a the next higher computing wheel.

relative traveling movement between the master wheel and the computing wheels of the totalizer 65, and unlocks the computing train in register with the master wheel. Considering this feature with reference to Fig. 1*, it will be seen that the master wheel 64 engages internally, in succession, each one of a series of computing wheels 91, the relative movement being efiected in the present instance, by the totalizer 65 itself being mounted to travel with the typewriter carriage, indicated at 92. I

Each of the computing wheels 91 is provided with an' external gear 93, which meshes with a corresponding gear 94, mounted on a dial wheel 95. A tens-carrying train 96 is provided for each computing wheel, whereby a complete rotation of, a lower computing wheel may be carried to This tens-carrying mechanism acts similarly to that shown in my above-mentioned application, and need not be specifically described, exceptthat it'comprises a complete gear 97 meshing with a higher computing wheel, and a mutilated gear 98, which may be driven from an associated barrel gear 99. Said barrel gear 99 is driven by the motor 12 through the shaft 7a as set forth in said application, with the result that the carrying over may be completed even after the index wheel 11 has been arrested. A similar carry-over device is shown in my Patent 1,020,082, dated March 12, 1912; i

The mutilated gear 98 is provided with a number of sockets or depressions 100, in which may rest a'locking or detent roller 101, there being one of these locking rollers for each of the computing wheels. Each locking roller 101 is mounted on a locking dog 102, which is normally pressed to its work by a spring 103.

When a computing operation starts, the bar 31, as has beenpreviously mentioned, is pulled up by the spring 32. The extension 87 thereof will likewise move up, carrying with it alink 10 1, which is connected to swing an arm 105, so as to rock a shaft 106.

This shaft carries, in registerwith the master wheel 64, an arm 107, which is at the same time a locking arm and an unlocking arm. That is to say, it is provided with a tooth or locking lug 108, which is arranged to engage between the teeth of a rack 108 carried by the frame of the totalizer 65. The arm 107 also has a beak 109, which is in range to engage the locking dog 102 which happens to be in engagement with the particular computing train in register with the master wheel.

It, will thus be .seen that the totalizer 65 is locked from a traveling movement at the same time that the computing train inregister with the master wheel is unlocked. The dog 102 is provided with ahook 110,

which is engaged by the beak 109 as the latter .disengages the dog 102, and thereby holds the totalizer 65 in a trued position, and prevents the same from wiggling up and down while the master wheel rotates.

When the starting mechanism is reset or reprimed as above described, the arm 107 will be returned to its normal position, permitting the totalizer 65 to take a step movement with the carriage 92, and also permitting the return of the locking dog 102 to prevent accidental rotation of its associated computin train.

It will e noted in passing that each locking do 102 is formed of a single strip of metal olded on itself in spaced relation to form a casing in which its locking roller 101 is pivoted, and folded in close relation at its lower end to form a strong rigid structure at the location of the hook 110.

' Variations may be resorted to within the scope of the invention, and portions of the improvements may be used without others.

Having thus'described my invention, I claim:

1. In a computing machine, the combination with computing mechanism, of a motor for driving. the same, including an electric circuit, connections between said motor and said computing mechanism,'a rock-shaft, a spring tending to rock said shaft to make said connections effective, lockin mechanism for said shaft including. a b ock. fixed on said shaft, said block controlling the closclosin ing of said electric circuit, and a latch engaging said block to thereby prevent sa d spring from rocking said shaft, to make sa1d connections effective, Y and said block from said circuit. a

2. he combinationv with a computing mechanism, of a starting mechanism for said computing mechanism, a motor for driving said computing. mechanism, a circuit to said motor, a' contactlmaker for said circuit, and

locking mechanism for said starting mechanism arranged to operate said contact maker to control the closing of the circuit'to said motor.

3. The combination with a computing.

mechanism, of starting mechanism for said computing mechanism, normally set so as to be sprung into operation to initiate a computing operation, a motor for driving said computing mechanism, a normally open circu1t for sa1d motor, circuit-closing means for sa1d c1rcu1t, and resetting mechanism arranged to reprime said starting mechanism,

and acting to maintain said circuit closed while it itself is in action.

' 4. The combination with a computing mechanism, of starting mechanism for said computing mechanism, a motor for driving sa1d computlng mechan1sm, a normally open circuit to said motor, a circuit closer for said motor, resetting mechanism for said starting n :chanism, and automatic meansfor controlling-saidcircuit closer from said resettiating a computing operation of said computing mechanism, said starting mechanism including a rotatable shaft, locking mechanism for said computing mechanism including a blocksecured to saidshaft and having a shoulder thereon, and a latch engaging said 1 shoulder tolock said shaft and said starting mechanism against action, ,and resetting mechanism acting to. overset said starting mechanism to insure the catching of. said -latch undersaid shoulder, and to securesaid startin mechanism in a primed condition ready or a subsequent computing operation.

7.; The combination' with a computing mechamsm, of a motor for driving said com puting mechanism, circuit-closing means for said motor, operating means for. said circuitclosing means, automatic, means operatingat the termination of a computing operation to return parts displaced during a computing operation to a normal position including sa1d operating means for closing saidcircuit and means for maintaining A said circuit-closing means. 1n posltion to ma1nta1ngsa1de1rcu1t closed during and by the action of said automatic mean 8. The combination, a

mechanism, of a motor forfdriving s ai cornputmg mechamsm, circu t-closingmeans for said motor, operating means for said circuitclosing means efiectlve durmg a comput ng operation of said computing mechanism,

automatic means coming into play at thetermination of a computing action of said computing mechanism, and delaying means con-.

. trolled from said automatic means to takeup the burden of holding said' circuit-closing meansin action to maintainsaidm tOr action after the computing operation has been completed. g 9. The combination ith a computing mechanism, of a motor for. driving said computing mechanism, a circuit to said motor,

circuit-closing means for said circuit, resettlng mechanism tending. toenablejthe return of sa1d clrcult-closlng means to itsx nact ve condition, and automatic means coming into 4 play while said resetting mechanism is in action,-for delayingthe openingo'f-the circuit. Y

V10..Theg combination with a computing mechanism, of a motor for driving said computing mechanism, a circuit to said motor, a pair of contacts for sa1d c1rcu1t,. a contact maker for bringing about .the engagement-jot,

said contacts, means for shiftingsaid =CQ1'1- tact maker, said contactmaker havinga-cam I 1 edge thereon, means brought into play automatically by said computing mechanism at the termination of a computingoperation,

and an arm. carried'by said last-mentioned means, engaging said cam edge to maintain said contact maker in action. y a I,

11. The. combination with a computing head havinga series of computingwheels, of a cletent individual to each, computing,

wheel, a master wheel for driving said: computing Wheels, said master wheelfa'ndsaid computing wheels having. a vrelativeg-Step by-step. movement Ito enable said: master r wheel to register successively. with each-of said computing. wheels, andoan arm fo r -engaging said, detents successively. to disengage them individually from said computing wheels, said detents andsaid arm,-ha vwingicofipersiting hook portions tohprevent and down movements ofsaidcomputing wliea'dlwhile said master. wheel-is rotating.

12. The combination: with .,a computing ihe'afd nhavin,g a serie ofcqmputing wheels,

ofia .master; wheel for driving said computinfgwheels, said master wheel and-said com- 7 'p'uting' wheels'having' a step-by-step move 'men t'toi cnablesaid master {wheel to register successi ely"- with each 1 computing train in chi-ding ,one ofs'ald computing Wheels, a

locking 'rack on said computing head, a se- 5: headihaving a s'eries'of computin'g'whieels,

' of a master-Wheel fordriving said computing-,wheels, said master wheel and sald computing-wheels' having a step-by-step'fmovej-- and an arm having a tooth to vengage between the teeth o t-said rack to lock'said jcom'fputing; head "against traveling move- 'ment," and"l1'aving a beak to engage indi- '"vidually"witheacliof said detents to disen- 80' computing trains,, said lde'ten'ts each having gage,saicl 'cletent from their associated a hook thereon to engage said beakindividually and"preventyibratory movements of saidf 'conipi'ltingjfhead; While said master I i wheel is rotating."

' 14, The combination with a computing "mechanism, of astarting mechanism for said computing mechanism,'a motorfl for driving said computing mechanism, a circuit to said I 40."

motor; contacts forf said circuitfoperating means controlledi'rom said. starting mechan'ismiorfapplying"pressuret'o said contacts to complete said circuit, and resetting 'mechani'sm' for starting mechanism,

'acting'to relievethe pressure onsaid con "tacts by said operating meanest the same f time applying other force to "maintain said contacts in engagement, while'fsaidiresetting ,t i ith computing' hg f tof f0 mechanism is in action;

' "-15. Infa comput1ng'machine,tlie combina i tionwith computing wheels, of apower' 'drlvej for turning'said' computingf wheels, said' 'drive cornprising an electric motor cir "fcuit; acontrol'ling membe fo thecomputing mechanism including "a rotatable shaft, i a latch" normally holding said shaft, means forreleasing said flatch, means; 'for putting s'aidfshaft under the control of said 'liatch and adapted to-overthrow said shatt'to in sure making sfaid'latch efiecti've', andjcon- "nections whereby said shaft clo es said cir- I cuit hensoj. overthrown;

. 16. In 'a' comput ng'm'achine, the

merit, to enable said master .wheel toregist'elr successively with each computing train "including one .of'sa'id computing wheels, a locliin'g'rack on-said computinghead, 'a se- -"ries"o,f'detents for. said'computing' wheels,"

driving said wheels comprising an electric clrcuit, a 'controllmg member for the computing mechanism adapted to close said circuit, a latch normally .holding'fsald oont'rolllng'member ineffective, meansfor releasing said latcli, connectionswhereb'y said motor pos tively restores said controlling 'member to its 'normal ineffective position,

and an extension of said connections for holding saidcircuit closed until the end of the restoring operation, 17. In a computing machine, the combina- "tion with computing Wheels, 'of'a motor for driving sald wheels comprlslng an electric circuit, a controlling member for the computing mechanism adapted to close said, circuit, a latch normally holding said controlling member ineffective, means for releasing said latch, connections whereby-"said motor positively restores said controlling member to its normalineffective position against the tension of a spring and overthro'ws said member to insure that the latch" will become effective thereon, and connections whereby the'motor circuit is heldclosed during suchvoverthrow. v

18. In a computing machine, the combination With a traveling carriage, a totalizer comprising computing wheels, and a master wheel for turning said wheels in an order determined by said carriage, of a" lock. for holding said carriage'against traveling, a motor for drivingsaid computing machine, a controlling member for said motonkeycontrolled means for making said controlling member effective, means ositively operated by said motor" for maging saidcontrolling member ineffecti.ve, and for positively unlocking said carriage, a motor circuit under the controlof said controlling member, and means'lfor positively holding said circuit closed until the carriage is unlocked. c i 1 419. The combination with computing mechanism, of a motor ,for driving said com; puting mechanism, a pair of electric terminals for controlling said motor, a keycontrolled controllingmember for closing thecircuit, a rotatable shaft formingpart of said controlling member, a cam on said shaft, and a follower cooperating with said 0am to positively hold said terminals-closed whenever said shaft is in its abnormal position." a v 20,"rhe combination with computing mech anism,.of a motor for driving said com-put- .i g i m, zaspa f c iete m for controlling {said motor, a key-controlled controlling member for closing said circuit, 1: l t= e shait farmin h r or sa d ni-= 1. s id-sh ft, a aidiea tj ta P ee e e Whe e fat means for overthrowing said shaft to cer-- tainly put it under the control of said latch. 21. In a power-driven computing machine,

the combination with a controlling member,

of an electric motor circuit driving said machine, a pair of terminals making and breaking said circuit, key-controlled means for starting said controlling member to close said circuit, means driven by said motor for resetting said controlling member, said means adapted to positively hold said circuit closed while so resetting said controlling member, and motor-driven means fortiming the breaking of said circuit.

22. In a combined typewriting and computing machine, the combination with computing wheels, of carry-over devices for said wheels, a motor for driving said wheels and said carry-over devices, a normally open circuit driving said motor, a controlling member for the computing mechanism and controlling said circuit, means for positively holding said circuit closed by said member until the end of a computation and for further positively holding it closed during the; resetting of said controlling member, and connections fonlallowing the motor to run idly after so resetting said controlling member, for operating the carry-over devlces.

23. In a compu'tin machine, the combination with an index w eel com rising settable pins, of keys for setting said pins, a controlling member, a motor circuit for driving said machine, an auxiliary member for bolding said circuit closed, and connections whereby the set pin makes the motor eifective to reset the controlling member and makes said auxiliary member efiective to hold the circuit closed to efiect said resetting.

24. In a computing machine, the combination'with a traveling carriage, of a totalizer 001ml 0! this patent maybe obtained for comprising computing wheels, a master wheel for turning said computing wheels seriati/in, a lock for holding said carriage against traveling movement, a motor for driving said master wheel, a controlling member for said motor, and positive means operated by said motor for interfering with the stopping of said motor as determined by said controlling member for a period determined by a given rotation of the motor itself.

25. The combination with computing mechanism adapted to compute 'a number, of a motor for driving said computing mechanism, acircuit controlling the activity of said motor, and controlling means for delaying the breaking of the circuit for a period subsequent to the actual computing of the number per se, determined by a given rotation of the motor itself.

26. The combination with a. digital computing mechanism, of'a motor for driving said computing mechanisimand controlling means for determining the extent of rotation of said motor such that it will rotate an extent proportionate to the digit computed, plus a fixed amount terminated due to a fixed subsequent movement of the motor itself.

27. A detent having a roller for cooperation with a socketed computing wheel, said detent comprising a strip of metal bent on itself in spaced relation to form a casing for said roller, and further converging in close contact to form an ample and rigid surfaceby which said detent maybe engaged and moved relatively to said oomputing wheel and held in its moved position.

GUSTAVE EDEGENER.

Witnesses:

E. SAUNDERS, W. O. WESTPHAL.

five cents each, by addressing the Gommissioner of Patents, Washington, D. 0." 

